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SA105C183KAR Folha de dados(PDF) 7 Page - AVX Corporation

Nome de Peças SA105C183KAR
Descrição Electrónicos  GENERAL INFORMATION
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Fabricante Electrônico  AVX [AVX Corporation]
Página de início  http://www.avx.com
Logo AVX - AVX Corporation

SA105C183KAR Folha de dados(HTML) 7 Page - AVX Corporation

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6
The Capacitor
25%
50%
75%
100%
Percent Rated Volts
2.5
0
-2.5
-5
-7.5
-10
0VDC
RVDC
-55 -35
-15
+5
+25 +45 +65 +85 +105 +125
Temperature Degrees Centigrade
+20
+10
0
-10
-20
-30
AVX C0G (NP0) T.C.
AVX X7R T.C.
1
10
100
1
10
100
1
KHz
KHz
KHz
MHz
MHz
MHz
GHz
Frequency
0
-10
-20
-30
AVX
C0G (NP0)
T.C.
AVX X7R T.C.
1
10
100
1
10
100
1
KHz
KHz
KHz
MHz
MHz
MHz
GHz
Frequency
2000
1600
1200
800
400
0
Figure 4
Figure 5
Figure 6
Figure 7
Cap. Change vs. D.C. Volts
AVX X7R T.C.
“Q” vs. Frequency
Typical Cap. Change vs. Temperature
AVX X7R T.C.
Cap. Change vs. Frequency
The effect of the application of DC voltage is shown in Figure
4. The voltage coefficient is more pronounced for higher K
dielectrics. These figures are shown for room temperature
conditions. The combination characteristic known as voltage
temperature limits which shows the effects of rated voltage
over the operating temperature range is shown in Figure 5 for
the military BX characteristic.
Effects of Frequency – Frequency affects capacitance and
dissipation factor as shown in Figures 6 and 7.
Variation of impedance with frequency is an important
consideration for decoupling capacitor applications. Lead
length, lead configuration and body size all affect the
impedance level over more than ceramic formulation variations.
(Figure 8)
Effects of Time – Class 2 ceramic capacitors change
capacitance and dissipation factor with time as well as
temperature, voltage and frequency. This change with time is
known as aging. Aging is caused by a gradual re-alignment of
the crystalline structure of the ceramic and produces an
exponential loss in capacitance and decrease in dissipation
factor versus time. A typical curve of aging rate for semistable
ceramics is shown in Figure 9 and a table is given showing the
aging rates of various dielectrics.
If a ceramic capacitor that has been sitting on the shelf for a
period of time, is heated above its curie point, (125°C for 4
hours or 150°C for 12 hour will suffice) the part will de-age and
return to its initial capacitance and dissipation factor readings.
Because the capacitance changes rapidly, immediately after de-
aging, the basic capacitance measurements are normally
referred to a time period sometime after the de-aging process.
Various manufacturers use different time bases but the most
popular one is one day or twenty-four hours after “last heat.”
Change in the aging curve can be caused by the application of
voltage and other stresses. The possible changes in
capacitance due to de-aging by heating the unit explain why
capacitance changes are allowed after test, such as
temperature cycling, moisture resistance, etc., in MIL specs.
The application of high voltages such as dielectric withstanding
voltages also tends to de-age capacitors and is why re-reading
of capacitance after 12 or 24 hours is allowed in military
specifications after dielectric strength tests have been
performed.


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